//****************************************************************************
// Product: "Blinky" example, EK-TM4C123GXL board, preemptive QK kernel
// Last updated for version 6.9.1
// Last updated on  2020-09-21
//
//                    Q u a n t u m  L e a P s
//                    ------------------------
//                    Modern Embedded Software
//
// Copyright (C) 2005-2020 Quantum Leaps. All rights reserved.
//
// This program is open source software: you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Alternatively, this program may be distributed and modified under the
// terms of Quantum Leaps commercial licenses, which expressly supersede
// the GNU General Public License and are specifically designed for
// licensees interested in retaining the proprietary status of their code.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <www.gnu.org/licenses>.
//
// Contact information:
// <www.state-machine.com/licensing>
// <info@state-machine.com>
//****************************************************************************
#include "qpcpp.hpp"
#include "blinky.hpp"
#include "bsp.hpp"

#include "TM4C123GH6PM.h"        // the device specific header (TI)
#include "rom.h"                 // the built-in ROM functions (TI)
#include "sysctl.h"              // system control driver (TI)
#include "gpio.h"                // GPIO driver (TI)
// add other drivers if necessary...

#ifdef Q_SPY
    #error Simple Blinky Application does not provide Spy build configuration
#endif

//Q_DEFINE_THIS_FILE

// Local-scope objects -------------------------------------------------------
#define LED_RED     (1U << 1)
#define LED_GREEN   (1U << 3)
#define LED_BLUE    (1U << 2)

#define BTN_SW1     (1U << 4)
#define BTN_SW2     (1U << 0)

// ISRs used in this project =================================================
extern "C" {

//............................................................................
void SysTick_Handler(void); // prototype
void SysTick_Handler(void) {
    QK_ISR_ENTRY();   // inform QK about entering an ISR
    QF::TICK_X(0U, nullptr); // process time events for rate 0
    QK_ISR_EXIT();  // inform QK about exiting an ISR
}

} // extern "C"

// BSP functions =============================================================
void BSP_init(void) {
    // NOTE: SystemInit() already called from the startup code
    //  but SystemCoreClock needs to be updated
    //
    SystemCoreClockUpdate();

    // configure the FPU usage by choosing one of the options...
#if 1
    // OPTION 1:
    // Use the automatic FPU state preservation and the FPU lazy stacking.
    //
    // NOTE:
    // Use the following setting when FPU is used in more than one task or
    // in any ISRs. This setting is the safest and recommended, but requires
    // extra stack space and CPU cycles.
    //
    FPU->FPCCR |= (1U << FPU_FPCCR_ASPEN_Pos) | (1U << FPU_FPCCR_LSPEN_Pos);
#else
    // OPTION 2:
    // Do NOT to use the automatic FPU state preservation and
    // do NOT to use the FPU lazy stacking.
    //
    // NOTE:
    // Use the following setting when FPU is used in ONE task only and not
    // in any ISR. This setting is very efficient, but if more than one task
    // (or ISR) start using the FPU, this can lead to corruption of the
    // FPU registers. This option should be used with CAUTION.
    //
    FPU->FPCCR &= ~((1U << FPU_FPCCR_ASPEN_Pos) | (1U << FPU_FPCCR_LSPEN_Pos));
#endif

    // enable clock for to the peripherals used by this application...
    SYSCTL->RCGCGPIO |= (1U << 5); // enable Run mode for GPIOF

    // configure the LEDs and push buttons
    GPIOF->DIR |= (LED_RED | LED_GREEN | LED_BLUE); // set direction: output
    GPIOF->DEN |= (LED_RED | LED_GREEN | LED_BLUE); // digital enable
    GPIOF->DATA_Bits[LED_RED]   = 0U;  // turn the LED off
    GPIOF->DATA_Bits[LED_GREEN] = 0U;  // turn the LED off
    GPIOF->DATA_Bits[LED_BLUE]  = 0U;  // turn the LED off

    // configure the Buttons
    GPIOF->DIR &= ~(BTN_SW1 | BTN_SW2); //  set direction: input
    ROM_GPIOPadConfigSet(GPIOF_BASE, (BTN_SW1 | BTN_SW2),
                         GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
}
//............................................................................
void BSP_ledOff(void) {
    GPIOF->DATA_Bits[LED_GREEN] = 0U;
}
//............................................................................
void BSP_ledOn(void) {
    // exercise the FPU with some floating point computations
    float volatile x = 3.1415926F;
    x = x + 2.7182818F;

    GPIOF->DATA_Bits[LED_GREEN] = 0xFFU;
}


// QF callbacks ==============================================================
void QF::onStartup(void) {
    // set up the SysTick timer to fire at BSP_TICKS_PER_SEC rate
    SysTick_Config(SystemCoreClock / BSP_TICKS_PER_SEC);

    // assing all priority bits for preemption-prio. and none to sub-prio.
    NVIC_SetPriorityGrouping(0U);

    // set priorities of ALL ISRs used in the system, see NOTE1
    //
    // !!!!!!!!!!!!!!!!!!!!!!!!!!! CAUTION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    // Assign a priority to EVERY ISR explicitly by calling NVIC_SetPriority().
    // DO NOT LEAVE THE ISR PRIORITIES AT THE DEFAULT VALUE!
    //
    NVIC_SetPriority(SysTick_IRQn,   QF_AWARE_ISR_CMSIS_PRI);
    // ...

    // enable IRQs...
}
//............................................................................
void QF::onCleanup(void) {
}
//............................................................................
void QK::onIdle(void) {

    // toggle LED2 on and then off, see NOTE01
    QF_INT_DISABLE();
    GPIOF->DATA_Bits[LED_BLUE] = 0xFFU;
    GPIOF->DATA_Bits[LED_BLUE] = 0x00U;
    QF_INT_ENABLE();


#ifdef NDEBUG
    // Put the CPU and peripherals to the low-power mode.
    // you might need to customize the clock management for your application,
    // see the datasheet for your particular Cortex-M3 MCU.
    //
    __WFI(); // Wait-For-Interrupt
#endif
}

//............................................................................
extern "C" Q_NORETURN Q_onAssert(char const * const module, int_t const loc) {
    //
    // NOTE: add here your application-specific error handling
    //
    (void)module;
    (void)loc;
    QS_ASSERTION(module, loc, 10000U);
    NVIC_SystemReset();
}

//****************************************************************************
// NOTE1:
// The QF_AWARE_ISR_CMSIS_PRI constant from the QF port specifies the highest
// ISR priority that is disabled by the QF framework. The value is suitable
// for the NVIC_SetPriority() CMSIS function.
//
// Only ISRs prioritized at or below the QF_AWARE_ISR_CMSIS_PRI level (i.e.,
// with the numerical values of priorities equal or higher than
// QF_AWARE_ISR_CMSIS_PRI) are allowed to call any QF services. These ISRs
// are "QF-aware".
//
// Conversely, any ISRs prioritized above the QF_AWARE_ISR_CMSIS_PRI priority
// level (i.e., with the numerical values of priorities less than
// QF_AWARE_ISR_CMSIS_PRI) are never disabled and are not aware of the kernel.
// Such "QF-unaware" ISRs cannot call any QF services. The only mechanism
// by which a "QF-unaware" ISR can communicate with the QF framework is by
// triggering a "QF-aware" ISR, which can post/publish events.
//
// NOTE2:
// One of the LEDs is used to visualize the idle loop activity. The brightness
// of the LED is proportional to the frequency of invcations of the idle loop.
// Please note that the LED is toggled with interrupts locked, so no interrupt
// execution time contributes to the brightness of the User LED.
//
